First slide

Electrolytic cells

Question

A current of 2.0 A passed for 5 hr. through a molten metal salt deposits 22.2 g of metal (at. mass 177). The valency of the metal in the metal salt is:

Moderate

Solution

$W = \frac{E \cdot i \cdot t}{96500}$
$\begin{array}{l} or E = \frac{W \times 96500}{i \cdot t} = \frac{22 .2 \times 96500}{2 \times 5 \times 60 \times 60} = 59 .5 \\ Valency = \frac{at. mass}{E} = \frac{177}{59 .5} = 3 \end{array}$

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